Sound absorbing composition



.a.teiipr.z, o4o' 1 '2,195,s80 1- s PATENT OFFICE.

Kenneth S. Rankin, Toronto, Ontario, Canada No Drawing. Application March 4, 1938, Serial Nor 193,919

2 Claims. (Cl. 106-24) This invention relates to a material adapted to weight where a mouldable mass is desiredor when be applied as a surface coating to walls for the a more plastic mass is required for-spreading in purpose of absorbing sound waves and to effecplastic form over surfaces, the quantity of water tively resist the transference of heat and the may be increased to effect the desired plasticity;

5 absorption of moisture so that buildings and A substance produced by the above admixture 5 rooms may be rendered soundproof and so that of materials will adhere to surfaces such as metal, even temperatures and humidity may be effecfibre, plastic or wood and when spread over a tively retained. I surface for a thickness of from one-eighth of an" Numerous materials have been proposed'for use inch to one inch oreven more, produces a coverin coating. walls which have sound-absorbing ing which may betroweled smooth and when dry 0 qualities but most of these are hygroscopic and is impervious to water, is fire-proof and effectively readily absorb, 'moisture'or are or" such a nature absorbs sound waves, so that sound produced in as to absorb and transfer heat and it is the a room, the walls of which are lined with this principal object of this invention to provide a material, will be deadened and sounds will not material which may be readily applied to struccarry through to adjacent rooms, nor will they be 15', tural surfaces at comparatively low cost and will reflected back to cause magnified or repeated elfectively resist the transference of sound, heat noises within the room, and moisture, and whichwill also present a fire- The resistance to heat and moisture prevents resisting surface. absorption of such from the air, consequently the The invention consists in the novel composition air may be retained at a desired temperature 20 and admixture of materials in or about'the foland humidity. for much greater than usual lowing proportions: periods and. the transference of heat or moisture from outside sources will also be prevented.

What I claim as my invention is;

l. A composite material comprising three parts by weight mineral wool, two parts by Lithopone or titanium oxide, 1% by weight of the Weight asbestos diatomite of weight of the total weight of the mineral wool and asbestos. combtned mi a W001 and q and a o p saponified sizing 1n the proportion of one to two The above materials e thoroughly m d in parts of the combined woo-l, asbestos and diat- 30 a y s te d a q y, approximately 1 p t omite, said sizing comprising an admixture of a by weight of a saponified sizing is then thoroughly fatty substance by weight about four parts, glue Commingled t tWO Parts of h Previously about three parts, alum about two parts and an mixed t alkali saponifier about one-quarter part.

The saponified Sizing Which is preferred 2. A composite material comprising 'approxi- 35 prises an admixture of a vegetable or animal oil t 1 three parts by weight of mineral W001,

Wa about u parts by Weig ue abou approximately two parts by weight of asbestos, three parts by weight, alum about two parts by Diatomite approximately 10% to 20% of the total weight, and an alkali saponifier about oneweight of mineral wool and asbestos, and approx- 40 quarter part by weight. imately one part by weight of a saponified sizing 40 Water is added to the admixture of the sizing to two parts of the above admixture. materials in an amount about equal to the total X KENNETH S. RANKIN.

UNITED! STATE Mineral wool, 3 parts by weight, 25 Asbestos, 2 parts by weight, I

Diatomite, from 10% to 20% by weight of the total weight of the mineral wool and asbestos, 

